# Credit Points – STACK

#### Question:

ShopClue is an online shopping platform and it is distributing gift vouchers to its esteemed users. The voucher can be redeemed by providing a fixed amount of shopping credit points.  Each credit point is sent by a user one by one. Since there is a huge rush of people you are required to manage the users on the basis of first come first serve.  To make this process easier, you are allowed to serve K no. of people at one time.  You are given an array where you can store the credit points of each user on first come first serve basis.  You can serve K people at a given point of time.  Finally you need to display the credits details of unserved people.  If all users are served at a time, then print “0 users to serve”

Input Format

The first input is the no. of users

The second input is the credit points of each user.

Output Format

Output shows the unserved users credit points.

If all users are served, then print “0 users to serve”

If no. of users are 0 or less than 0 or greater than 1000 then print “Invalid no. of users”

If no. of users to server (K) is less than or equal to 0 or greater than no. of users, then print “ Invalid no. of users”

Constraints:
1<=n<=1000
1<=a[i]<=100
1<=k<=n

Note: Create the main() function inside the class “ShopMain”

Sample Input 1:

Enter the no. of users:5

Enter the credit points for user 1: 4

Enter the credit points for user 2: 5

Enter the credit points for user 3: 2

Enter the credit points for user 4: 8

Enter the credit points for user 5: 4

Enter the no. of users to serve: 3

Sample Output 1:

The unserved user’s credit points are: 8 4

Sample Input 2:

Enter the no. of users: 0

Sample Output 2:

Invalid no. of users

Sample Input 3:

Enter the no. of users: 3Enter the credit points for user 1: 4

Enter the credit points for user 2: 5

Enter the credit points for user 3: 2

Enter the no. of users to serve: 3

Sample Output 3:

0 users to serve

Sample Input 4:

Enter the no. of users: 2

Enter the credit points for user 1: 7

Enter the credit points for user 2: 2

Enter the no. of users to serve: 3

Sample Output 4:

Invalid no. of users

Sample Input 5:

Enter the no. of users: 2

Enter the credit points for user 1: 5

Enter the credit points for user 2: 8

Enter the no. of users to serve: 0

Sample Output 5:

Invalid no. of users

Sample Input 6:

Enter the no. of users: -1

Sample Output 6:

Invalid no. of users

#### ShopMain.java

```import java.util.*;

public class ShopMain
{
public static void main (String[] args) {
Scanner sc=new Scanner(System.in);
System.out.print("Enter the no. of users:");
int n=sc.nextInt();
System.out.println();
if(n>=1 && n<=1000)
{
int[] a=new int[n];
int temp=0;
while(temp<n)
{
System.out.print("Enter the credit points for user "+(temp+1)+":");
a[temp]=sc.nextInt();
if(a[temp]>=1 && a[temp]<=100)
{
temp++;
System.out.println();
}
else
{
break;
}
}

System.out.print("Enter the no. of users to serve: ");
int k=sc.nextInt();

if(k>=1 && k<n)
{
System.out.print("The unserved user's credit points are: ");
for(int i=(k);i<n;i++)
{
System.out.print(a[i]+" ");
}
}
else if(k==n)
{
System.out.println("0 users to serve");
}
else
{
System.out.println("Invalid no. of users");
}

}
else{
System.out.println("Invalid no. of users");
}
}
}```